Fluid operated tool



'2, 1932- A. H. KTT'ERJoHN FLUID -VOPERATED TOOL c cylinder of the tool is shown at 1, an

Patented Aug. 2, 1932 PATEN'r' OFFICE UNITED STATES AUGUST H. KATTERJOHN, OF DENVER, COLORADO, AssIGNoncro GARDNER-DENVER fr,

COMPANY, OE DENVER, COLORADO,l AA OOREOEATION OE DELAWARE FLUID OPEEATED TOOL Application filed September 20, 1929. lSerial No. 394,081. i

The present invention relates more particularly to chucks for rock drills, the object being to provide a structure in which the parts subject to wear, are readily removable and replaceable and in which the bearing and weight of the chuck structure is widely distributed.

The preferred embodiment of the invention is illustrated in the accompanying drawing, wherein:

Figure 1 is a longitudinal sectional view through the chuck end of a rock drill.

Figure 2 is a front end elevation of 'the rear section of the chuck driver sleeve meinber.

Figure 3 is a longitudinal sectional view on the line 3-3 of Figure 2.

In the embodiment disclosed the barrel or d has fitted into its front end the rear portion 5 of a bushing. This bushinghas a front portion 6 projecting beyond the barrel and having an outstanding annular flange 7 abutting said barrel. A chuck housing 8 has its rear end fitted on to the projecting portion 6 of the bushing and abutted against the flange 7. This housing has in its rear portion and in line with the front end of the projecting portion of the bushing 6, a rearwardly faced shoulder 9 that is spaced from the front end of the portion 6. The chuck housing 8 has at its front end a rearwardly faced internal annular shoulder 10 of less diameter than the shoulder 9. Preferably the housing is in one piece as shown.

In the front end of the housing 8 is a rotatable chuck 11 having a suitable socket 12 for the reception of a steel 13 or other tool. This chuck 11 has a peripheral outstanding annular flange 11 that is behind and bears against the shoulder 10. A driver sleeve member is located in the housing and Consists of a front section 15 and a rear section 16. The front end of the front section fits around the rear end of the chuck behind the flange 14 and is abutted against said flange. It is provided with inset keys or gibs 17 slidably engaging in grooves 18 in the rear end of the chuck 11. The rear end of the driver sleeve section 15 is provided with an enrality' of radially larged head 19 that is abutted against the i rearI shoulder 9 and isrprovided with` a pluldisposed rearwardly eX- tending clutch lugs or teeth 20. The rear driver sleeve .section 16 is portion of the bushing 5 which hasarren-v tted into the front L larged bore21 for the purpose andthe front l.

end of this section "16 'has an .enlarged head 22 at its front ,end-which head 4is provided withsockets .Qthat' receive the lugs 2O sol `thatthe front andrear'sections are interlocke'd and will rotate together. The heads 19 and 22 lit betwee the rearshoulder 9 of the chuck housing 8 and the frontend of the forward extension 6.of3the bushing 5.f

In the rear section-16 is mounted thepusual 'driver'n nut 24 that is splinedfas shown at 25 to the .hammer extension 26 of the usual hammer piston 27. In the present structure this hammer'piston operates on a tappet 28 fitted in the front driver sleeve section 15 and projecting rearwardly into the rear section 16 and into the path of the hammer extension 26. The rear end of the tool shank 13 abuts the front end of the tappet.

This structure has proven a very satisfactory one in operation because it permits the removal and ready re-assembling of the chuck structure and the substitution of parts that are subject to excessive wear. More than that it will be noted that the chuck driver and chuck have bearings against the shoulders 9 and 10 of the housing so that the Weight of the part-s and the wear is distribute From the foregoing, it is thought that the ISO construction, operation and many advantages ing internal annular bearing shoulders, a chuck journaled in the front portion of the housing and having an outstanding annular fiange bearing against the front shoulder, a chuck driver sleeve member journaled in the housing and slidably interlocked with the Chuck behind the ange, said sleeve member having an annular flange bearing against the rear shoulder, a driving sleeve having an annular flange correspondingto that carried by the driver sleeve, interlooking'fingers carried upon the abutting faces of both flanges, andk a splined connection between the driving sleeve and the piston.

2. In a fluid operated tool, in combination with a barrel, and a hammer'piston-therein, of a chuck housing at the front end of the barrel, having a plurality of? rearwardly facing internal annular bearing shoulders, a chuck ournaled"` in the front portion of the housing and having a bearing against oneof the shoulders, a chuck driver sleeve journal in the housing and slidably interfitting l with the chuck and' having an outstanding flange forming a bearing against the other of said shoulders, and said sleeve member compris-y ing separable sections coupled rearwardly of the last said shoulderk and through the outstanding flange, and a splinedsection-between the rear section ofthe sleeve and-theV piston.

In testimony whereof, I aix my signature.

' AUGUST H. KATTERJOHN. 

